IPCS

NAME

ipcs - show information on IPC facilities

SYNOPSIS

ipcs
[options]

DESCRIPTION

ipcs
shows information on the inter-process communication facilities
for which the calling process has read access.
By default it shows information about all three resources:
shared memory segments, message queues, and semaphore arrays.

OPTIONS

-i, --idid

Show full details on just the one resource element identified by
id.
This option needs to be combined with one of the three resource options:
-m,
-q or
-s.

-h, --help

Display help text and exit.

-V, --version

Display version information and exit.

Resource options

-m, --shmems

Write information about active shared memory segments.

-q, --queues

Write information about active message queues.

-s, --semaphores

Write information about active semaphore sets.

-a, --all

Write information about all three resources (default).

Output formats

Of these options only one takes effect: the last one specified.

-c, --creator

Show creator and owner.

-l, --limits

Show resource limits.

-p, --pid

Show PIDs of creator and last operator.

-t, --time

Write time information. The time of the last control operation that changed
the access permissions for all facilities, the time of the last
msgsnd(2)
and
msgrcv(2)
operations on message queues, the time of the last
shmat(2)
and
shmdt(2)
operations on shared memory, and the time of the last
semop(2)
operation on semaphores.

-u, --summary

Show status summary.

Representation

These affect only the -l (--limits) option.

-b, --bytes

Print sizes in bytes.

--human

Print sizes in human-readable format.

SEE ALSO

CONFORMING TO

The Linux ipcs utility is not fully compatible to the POSIX ipcs utility.
The Linux version does not support the POSIX
-a,
-b
and
-o
options, but does support the
-l
and
-u
options not defined by POSIX. A portable application shall not use the
-a,
-b,
-o,
-l,
and
-u
options.

AUTHOR

Krishna Balasubramanian

AVAILABILITY

The ipcs command is part of the util-linux package and is available from
Linux Kernel Archive